Green-emissive transparent BaSi2O5:Eu2 + film phosphor on quartz glass created by a sputtering thermal diffusion process

Eu2+-doped BaSi2O5 film phosphors on quartz substrates are fabricated by radio-frequency magnetron sputtering thermal diffusion. The BaSi2O5: Eu2+ phosphor crystals have some preferred orientations that are lattice-spacing matched with the crystallized ββ- SiO2 crystals, and they show pore and grain boundary-free morphology with a rod-like shape fused into the crystallized ββ- SiO2 crystals. The BaSi2O5: Eu2+ film phosphor has a high transparency, with a transmittance of about 30% in visible light. The BaSi2O5: Eu2+ film phosphor shows 510 nm green emission from the f–d transition of the Eu2+ ions, and in particular the best sample shows a green photoluminescence brightness of about 5% of a BaSi2O5: Eu2+ powder phosphor screen. These excellences in optical properties can be explained by less optical scattering at pores or grain boundaries, and less reflection at the continuously index-changed interface.